KR101600297B1 - Self oscillation circuit and power supply using the same - Google Patents

Abstract

One embodiment of the present invention relates to an oscillation circuit that can be applied when a multi-output insulated power supply with less variation in load is required, and a power supply device using the same. A square wave generator for generating a square wave signal; A dead time generator for delaying a rise time or a fall time of the signal in the inverted signal and the non-inverted signal of the square wave signal to generate a dead time in the square wave signal; And an output unit for outputting a current amplified signal of the inverted signal and the non-inverted signal of the square wave signal in which the dead time is generated; Phase full bridge inverter with a fixed pulse width using an oscillating circuit including a transformer, a transformer with a smaller number of taps on the secondary side, and a required multi-output insulation voltage as a standardized bobbin. This makes it possible to simplify circuit construction by eliminating the need for complex PWM control ICs and voltage and current feedback circuits at loads with low load fluctuations, and by providing a simple configuration in the form of OPEN-LOOP when multiple isolation voltages are required An insulation voltage can be output.

Description

TECHNICAL FIELD [0001] The present invention relates to an oscillation circuit and a power supply device using the oscillation circuit.

The present invention relates to an oscillation circuit and a power supply device using the oscillation circuit.

Generally, in order to drive an inverter, various kinds of insulated power sources such as a power source for a control device, a power source for various sensors, a power source for an external terminal, and a power device driving power source are required. In addition to various control power sources, the output of the inverter consists of three phases, each phase consisting of two power elements. Six separate power supplies are required to drive six power devices.

The number of pins of a standardized bobbin is limited, and a plurality of insulated power supplies may be required. In this case, a plurality of transformers are required and additional additional circuit parts may be additionally required.

In order to design a multi-output insulated power source as a single transformer, the number of transformer's bobbin pins is complicated because the output of the transformer increases, and a bobbin made of a separate mold is usually applied. In addition, when a plurality of transformers are designed to apply a standardized bobbin, there is a problem that a plurality of PWM ICs and circuits for voltage control must be constituted to generate PWM.

In order to solve the above problems, an embodiment of the present invention provides an oscillation circuit and a simple power supply using the oscillation circuit.

According to one technical aspect of the present invention, there is provided a square wave generating unit for generating a square wave signal using an oscillation circuit; A dead time generator for generating a dead time in the square wave signal by delaying a rise time or a fall time of the signal in the inversion signal and the non-inversion signal of the square wave signal to prevent a short circuit of the inverter unit; And an output unit for outputting an inverted signal and a non-inverted signal of the rectangular wave signal in which the dead time is generated; Phase full-bridge inverter using an oscillation circuit including a rectifier and a rectifier. After applying an AC voltage to the transformer, the AC voltage is rectified and smoothed, and the voltage is distributed using a zener diode and a resistor according to the driving voltage and the load of the power device. We propose an open loop power supply that can be used as a driving voltage for a power device.

The square wave generator may generate a square wave using an oscillation circuit including a resistor and a capacitor, and may adjust the time constant of the oscillation circuit to determine the frequency of the square wave.

The dead time generator may include a delay element, and the length of the dead time may be determined by adjusting the time constant of the delay element.

Further, the dead time length can be determined by adjusting the time point at which the threshold voltage of the rear stage semiconductor device of the dead time generator reaches the threshold voltage.

The output unit may include an inverter, a delay element, and a buffer. The inverter, the delay element, and the buffer may be used to generate a plurality of output signals including a dead time.

According to one technical aspect of the present invention, there is provided an oscillation circuit comprising: an oscillation circuit for supplying a plurality of synchronized square wave signals to a gate; An inverter receiving the square wave signals and converting the square wave signals into an AC voltage; A transformer for adjusting the magnitude of the AC voltage; And a power output unit for rectifying the AC voltage input from the transformer to generate a DC voltage, smoothing the rectified voltage to generate a DC voltage, and distributing the voltage according to a required load. Wherein the oscillation circuit part generates a dead time in the square wave signal by delaying the rising time or the falling time of the signal in the generated square wave signal to drive the single phase full bridge inverter and insulates the single phase full bridge inverter through a transformer, Device.

The transformer may further include: a primary unit having one tab for receiving the AC voltage; And a plurality of taps for adjusting and outputting the magnitude of the received AC voltage; (-) voltage and a floating ground to reduce the number of taps included in the secondary side or the number of pins of the bobbin included in the power output unit, Can be separated and output by at least two power sources.

By using a simple oscillating circuit, a standardized bobbin is applied to a power structure requiring several insulated power supplies, so that it can be easily configured without a separate PWM IC or a feedback circuit.

In addition, by generating a dead time for a square-wave signal, it is possible to prevent an arm-short in a single-phase full-bridge circuit. As a result, it is possible to output the inverted signal and the non-inverted signal of the square wave in a required form according to the circuit type.

In addition, the transformer's secondary insulation power source can be realized with a single tap, and the transformer can be realized with a small number of taps by implementing the Zener diode and the resistor according to the required power specification.

1 is a diagram showing a power supply apparatus using an oscillation circuit according to an embodiment of the present invention.
2 is a diagram showing an oscillation circuit according to an embodiment of the present invention.
3 is a graph showing voltages at respective nodes of an oscillation circuit according to an embodiment of the present invention.
FIG. 4 is a circuit diagram showing a conventional multi-output power supply apparatus applied when multiple isolated power supplies are required.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In this application, the term "comprising" should not be construed as necessarily including the various elements or steps described in the specification, and some of the elements or portions thereof may not be included, Or < / RTI > additional elements or steps.

Further, the suffix "part" for a component used in the present specification is given or mixed in consideration of ease of specification, and does not have a meaning or role that is different from itself.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 is a diagram showing a power supply apparatus using an oscillation circuit according to an embodiment of the present invention.

1, the power supply unit 1 may include an oscillation circuit unit 100, a single-phase full-bridge inverter 200, a transformer 300, and a power output unit 400.

The oscillation circuit unit 100 can supply a plurality of synchronized square wave signals to the gate of the single-phase full-bridge inverter. For example, the square wave signals can be supplied through a plurality of output stages (AH, AL, BH, BL). Specifically, the gate drive unit may generate a dead time for the square wave signal by delaying a rise time or a fall time of the signal in the generated square wave signal.

The oscillation circuit part 100 includes a delay element and a semiconductor element and adjusts the time constant of the delay element to delay a time point at which the threshold voltage of the semiconductor element reaches a threshold voltage, You can decide. A detailed description of the dead time of the oscillation circuit part 100 and the generation of the gate voltage of the single-phase full-bridge inverter will be described below with reference to FIG.

The single-phase full-bridge inverter 200 receives the gate signals and converts them into an AC voltage. Here, the single-phase full-bridge inverter 200 may include a semiconductor device such as an IGBT or a FET, and may control the switching of the semiconductor device to convert the DC voltage Vdc into an AC voltage. For example, the gate terminals of the semiconductor elements included in the single-phase full-bridge inverter 200 are connected to a plurality of output terminals AH, AL, BH, and BL of the oscillation circuit unit 100, .

The transformer 300 can adjust the magnitude of the AC voltage. For example, the primary side of the transformer 300 can receive an AC voltage from the single-phase full bridge inverter 200, and the secondary side of the transformer 300 can control the magnitude of the AC voltage. In addition, the secondary side of the transformer 300 may be constituted by a plurality of circuits, and the magnitude of the AC voltage may be varied by varying the winding voltage. In this case, the plurality of circuits can operate independently of each other and can be a plurality of insulation voltages.

In addition, the transformer 300 may include: a primary unit including one tab for receiving the AC voltage; And a plurality of taps for adjusting and outputting the magnitude of the received AC voltage; (-) voltage and a floating ground to reduce the number of taps included in the secondary side or the number of pins of the bobbin included in the power output unit, Can be separated and output by at least two power sources.

The power output unit 400 may rectify and smooth the AC voltage input from the transformer to generate a DC voltage and adjust the magnitude of the DC voltage to output power. To this end, the power output unit 400 may include a capacitor and a diode to rectify and smooth the AC voltage. The Zener diode and the resistor may be used to divide the voltage into (+) voltage, (-) voltage, The magnitude of the required direct current voltage can also be adjusted.

Also, the power output unit 400 may output at least two independently generated insulated power supplies. For example, when a multi-output isolated power supply is required under constant load conditions, it can be configured as a standardized bobbin, operating at a fixed pulse width without using a PWM IC and feedback circuitry.

As described above, the power supply device 1 using the oscillation circuit can easily construct a circuit because a complex PWM control IC and a voltage and current feedback circuit are not required in a load with a small load fluctuation, and when a plurality of insulation voltages are required The desired isolation voltage can be output with a simple configuration of OPEN-LOOP type.

2 is a diagram showing an oscillation circuit according to an embodiment of the present invention.

2, the oscillator circuit unit 100 may include a square wave generator 110, a dead time generator 120, and an output unit 130.

The square wave generating unit 110 can generate a square wave signal. That is, it is possible to control the switching of the semiconductor devices included in the single-phase full-bridge inverter 200 and to generate a rectangular wave signal for supplying the switching energy.

In addition, the square wave generating unit 110 may generate a square wave using an oscillation circuit including a resistor and a capacitor. For example, when the output voltage of the square wave generator 110 is High, the voltage discharged through Ro charges Co. When this voltage reaches the threshold level recognized as High in the device input part, the output voltage becomes low. When the voltage charged in Co is discharged again and reaches the threshold level recognized as Low in the device input part, the output voltage becomes high, Can be generated.

Meanwhile, the frequency of the square wave can be determined by adjusting the time constant of the oscillation circuit. For example, the oscillation circuit may include a resistor and a capacitor. In this case, the product of the resistance and the capacitor is a time constant, and the frequency of the square wave can be determined by adjusting the time constant.

The dead time generator 120 may delay the rise time of the signal in the inverted signal and the non-inverted signal of the square wave signal to generate a dead time in the square wave signal. Here, the rising time is a time when the value of the square wave signal changes from Low to High.

Since the dead time has a switching delay time of the upper power element and the lower power element of each phase when a rectangular wave driving signal is input to the single-phase full bridge inverter, a short-circuit current is generated to prevent the power element from being burned and deteriorated need. Meanwhile, the dead time may change the waveform of the rectangular wave signal.

Specifically, the dead time generator 120 includes a delay element, and the length of the dead time can be determined by adjusting the time constant of the delay element. Here, the delay element may include a resistor, a capacitor, and a diode. That is, since the voltage of the capacitor rises slowly as the time constant is increased, the dead time length may become longer.

The dead time generator 120 may include a semiconductor device and may determine a dead time length by adjusting a time point at which the threshold voltage of the semiconductor device reaches a threshold voltage. Here, the semiconductor device may be a CMOS inverter. In this case, when the input of the inverter reaches the threshold voltage or more, the output of the inverter changes.

The output unit 130 may output an inversion signal and a non-inversion signal of the square wave signal in which the dead time is generated. Here, the output unit 130 may include a resistor for smoothly receiving the rectangular wave signal, and may determine the value of the resistor in consideration of the output impedance of the dead time generator 120. If the value of the resistance is adjusted, the square wave signal may be amplified. For example, the square wave signal can be amplified to supply the current needed to drive the FET.

In addition, the output unit 130 includes an inverter and a buffer, and can synchronize a plurality of output signals using the inverter and the buffer. For example, the time for processing the signal in the inverter and the time for processing the signal in the buffer can be synchronized and synchronized.

Meanwhile, the output unit 130 may independently receive the inversion signal and the non-inversion signal of the square wave signal from the dead time generator 120, and invert and invert the respective signals. In this case, two inverted and non-inverted signals of the square wave can be outputted through the buffer, and two inverted signals (or two non-inverted signals) are output with the dead time length due to the error of the time constant error and the threshold voltage level It may be slightly different.

3 is a graph showing voltages at respective nodes of an oscillation circuit according to an embodiment of the present invention.

Node 0 is the output node of the square wave generating unit 110. A square wave having a duty ratio of 50% can be output by the oscillation circuit.

Node 1 is the input node of the dead time generator 120. An inverter can be added to the node 0 and inverted.

Node 2 is the inverted output node of the dead time generator 120. The rising speed of the voltage may be slow and the falling speed may be fast. For example, the diode and the resistor may be arranged in parallel. When the diode has a reverse bias voltage, the effective resistance value is Rd, but when the diode has a forward bias voltage, the effective resistance value is substantially zero. The larger the effective resistance value is, the larger the time constant value and the voltage change rate of the capacitor are slowed down. Accordingly, when the diode and the resistor are arranged in parallel, the rising speed and the falling speed of the voltage may be different.

Node 3 is a non-inverting input node of the dead time generator 120. [

Node 4 is a non-inverted output node of dead time generator 120. [ May be the same as the operation principle in the inverted output of the node 2. [

Node 5 (AL, BH) is the output node of output 130 that receives the non-inverted signal of the square wave. The falling time of the BH voltage and the rising time of the AL voltage may be slowed at the node 5 as the rising speed of the voltage at the node 2 is slowed down.

Node 6 (AH, BL) is the output node of the output section 130 which receives the inverted signal of the square wave. Since the position of the dead time generated at the node 4 is different from the position of the dead time generated at the node 2, the fall time of the AH voltage and the rise time of the BL voltage at the node 6 are slowed down.

1, the BH voltage of the node 5 and the AH voltage of the node 6 are P-channel gates of the single-phase full-bridge inverter 200, and the AL voltage of the node 5 and the BL voltage of the node 6 are input to the N-channel gate . The AH voltage and the BL voltage simultaneously drive a P-channel FET and an N-channel FET to make a (+) voltage on the primary side of the transformer, while the BH and AL voltages simultaneously drive the P- (-) voltage is generated. Accordingly, the primary side of the transformer 300 can be converted to an alternating voltage. Since the transformer 300 receives the (+) square wave voltage and the (-) square wave voltage in which the dead time is generated, a DC-blocking capacitor is applied to prevent the horn of the transformer depending on the magnitude of the voltage and the on- .

FIG. 4 is a circuit diagram showing a conventional type of multi-output power supply apparatus applied when multiple insulated power supplies are required.

Specifically, when a plurality of insulated power supplies are required, it is possible to distinguish between a power source type of a circuit which generates errors according to accuracy such as a sensor power source or a control power source, and a power source type that does not require precision, such as a power source power source. The part of the power source that requires precision is a separate transformer that controls the voltage through the feedback circuit. The other part of the power source, which does not require precision, receives the input DC voltage from one output of the voltage control circuit, It is possible to make the power easily by constituting a circuit and a transformer which generate a fixed pulse width.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

1: Power supply device 100: Oscillation circuit part
110: Square wave generator 120: Dead time generator
130: Output section 200: Single phase full bridge inverter
300: Transformer 400: Power output section

Claims (6)

delete A square wave generator for generating a square wave signal;
A dead time generator for generating a dead time for the square wave signal by delaying a rise time or a fall time of the signal in the inverted signal and the non-inverted signal of the square wave signal; And
An output unit for outputting an inverted signal and a non-inverted signal of the rectangular wave signal in which the dead time is generated; Lt; / RTI >
Wherein the square wave generator generates a square wave using an oscillation circuit including a resistor and a capacitor and adjusts a time constant of the oscillation circuit to determine a frequency of the square wave.
A square wave generator for generating a square wave signal;
A dead time generator for generating a dead time for the square wave signal by delaying a rise time or a fall time of the signal in the inverted signal and the non-inverted signal of the square wave signal; And
An output unit for outputting an inverted signal and a non-inverted signal of the rectangular wave signal in which the dead time is generated; Lt; / RTI >
Wherein the dead time generator includes a delay element and adjusts a time constant of the delay element to determine a length of the dead time.
A square wave generator for generating a square wave signal;
A dead time generator for generating a dead time for the square wave signal by delaying a rise time or a fall time of the signal in the inverted signal and the non-inverted signal of the square wave signal; And
An output unit for outputting an inverted signal and a non-inverted signal of the rectangular wave signal in which the dead time is generated; Lt; / RTI >
Wherein the output section includes an inverter and a current amplification buffer,
And an oscillation circuit for adjusting and synchronizing a plurality of output signals using the inverter and the current amplification buffer.
An oscillation circuit for supplying a plurality of synchronized rectangular wave signals to the gate;
A single-phase full-bridge inverter receiving the square wave signals and converting the square wave signals into an AC voltage;
A transformer for adjusting the magnitude of the AC voltage;
A power output unit for rectifying and smoothing the AC voltage input from the transformer to generate a DC voltage and regulating the magnitude of the DC voltage to output power; ≪ / RTI >
6. The transformer of claim 5,
A primary unit including one tab for receiving the AC voltage; And
A secondary side including a plurality of taps for adjusting and outputting the magnitude of an input AC voltage; / RTI >
In order to reduce the number of taps included in the secondary side or the number of pins of the bobbin included in the power output unit, the secondary side uses at least two positive voltages, negative voltages, and floating grounds, And outputs the separated power.

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